Hydraulic lifting arrangement



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HYDRAULIC LIFTING ARRANGEMENT Filed March 26, 1940 6 Sheets-Bhet 6 I ||l| ulmllumrll Patented July 20, 1943 HYDRAULIC LIFTING ARRANGEMENT Carl W. Mott, La Grange, Ill., assignor to Inter national Harvester Company, a corporation of New Jersey 1 Application March 26, 1940, Serial No. 326,059 17 Claims. (01. 97 so) This invention relates to hydraulic lifting arrangements particularly adaptable for the lifting of implements directly connected to tractors and movable with respect thereto to and from their ground-working positions.

The arrangement is similar to the arrangement covered in a copending application by A. C. Lindgren and the present inventor, Serial No. 181,778, filed December 27, 1937, now Patent No. 2,213,401, issued Sept. 3, 1940.

It is one object of the present invention to provide an improved lifting arrangement of this type which is of simple design and readily adaptable for commercial production.

It is another object of the invention to provide in a hydraulic arrangement of this type a safety means which will automatically prevent operation of the control mechanism when the tractor and the hydraulic pump are not operating.

It is still another object of the invention to provide in a hydraulic arrangement of this type an automatic valve which insures successive operation of front and rear connected implements, respectively.

It is still another object of the invention to provide in a hydraulic arrangement of this type a by-pass valve of the sleeve type which permits passage of fluid to a pressure responsive kickout mechanism, even though the sleeve valve is moved to its closed position and thereby to cheapen the cost of construction of the arrangement by the elimination of parts.

It is a still further object of the invention to provide an improved assemblage of pump control mechanism and reservoir housing within the body of the tractor, wherein the same can be readily assembled or disassembled.

For other objects and a better understanding of an illustrative form of detail construction, reference may be had to the following description taken in connection with the accompanying drawings, in which:

Figure 1 is a view in elevation of a tractor with one of the rear wheels removed and with front and rear implements directly connected thereto and arranged for operation by the hydraulic arrangement, which is also shown;

Figure 2 is a plan view of the tractor and of the implement, showing particularly the arrangement of the lifting cylinders and their connections with respective implements;

Figure 3 is an enlarged view in elevation, showing in section the portion'of the tractor into which the hydraulic reservoir and control mechanism is fitted;

' the reverse.

anism susceptible Figure 4 is a view taken substantially along the line 4-4 of Figure 3, showing particularly in detail the control mechanism for the arrangement;

Figure 5 is a view taken along the same line 4-4 of Figure 3, but looking in the direction of the arrows 55, wherein is shown in detail the same sleeve-valve and control arrangements in direction from the showing in Figure 4;

Figure 6 is a detail showing of the pump and the plunger eflective to render the latch mechto operation;

Figure 7 is a view in elevation and in crosssection of the fluid-operable cylinder device and delayed lift valve associated with the same; I

Figure 8 is a view of the delayed lift valve taken in the direction of the arrows 8-8 of Figure 7; j I

Figure 9 is a cross-section of the cylinder and piston of Figure 7 an taken along the line 9-9 thereof; and,

Figure 10 is a view in section of the same cylinder shown in Figure 7 and taken in the direction of the arrows along line Hi -I0 thereof.

Referring now particularly to Figures 1 and 2, there is shown an implement supporting means in the form of a, tractor, indicated generallyat 15, having a side frame construction 16 and a transmission and diiferential housing l1. Extending laterally from the transmission and differential housing 11, at each side thereof, are the rear axle housings l8 and 19, respectively, in which there is connected with the differential mechanism rear drive axles 20 and 2|, respectively, for the driving of the drive wheels 22, which support the rear of the tractor. The forward portion of the tractor is supported by steerable wheel construction 23 operated by the steering wheel 24 located proximate the operators station 25.

On the side frame construction 16 there is connected, at each side of the tractor, transversely projected tool-carrying brackets 26 and2-1, re-

spectively. Since the implements at each side of the tractor are similar; only the one at one side will be described. To the bracket 26 there is connected the tool cam 28 having the tools 25 connected thereto Immediately above the tool beam and extending parallel therewith is a link 3| connecting the transverse bracket 26 with the tool beam bracket 372/011 the bracket as there is plvotally mounted a pivotal lever 33, the upper end of which is pivotally connected to a lifting rod 34 extending along the side of the tractor to Q be supported at the rear thereof by a second pivotal lever 35 pivoted at 36 to the rear axle housing l8. Forwardly pivotal movement of these levers 33 and 35 effects lifting of the front implement by means of lifting rods 31. extending through transversely extending ears 38 on the upper end of the lever 33. As this lever 33 is pivoted forwardly, the ear 38 contacts with a spring 39 retained on a rod by a collar 49 and will thereby cause a lifting movement of the implement through the connection of the rod 31 to the bracket 32 at 4]. Should the implement contact with the under portion of the tractor and to prevent breakage of any of the equipment, the spring 39 will contract sufficiently to permit forward movement of the lever 33 with respect to the lifting rod 31. The spring 39 is of sufficient tension as not normally to contract until greater force is applied to the lever than is normally necessary for the lifting of the implement.

Connected to the rear axle housings l8 and I9 by means of quick detachable bracket constructions 43 and 44, respectively, is a transversely extending implement-supporting shaft 45. To this shaft is pivotally connected outer implement beams 46 and 41, at the right and left side of the tractor respectively, and a central beam 48. Also carried by the brackets 43 and 44 is a transversely extending rock-shaft 59 having lifting arms 5| and 52 connected respectively with the implement gangs 46 and 41 by means of usual lift rods 53 and 54. In order to tie the outer members 46 and 41 together, there is provided a transversely extending jockey member 55, to the mid-portion of which is' c0nnected the central beam 48 by ment to the central beam is effected through the jockey member.

Fitted within the under portion of the transmission and differential housing H at a location substantially midway the length of the tractor, is a fluid pump-control valve mechanism including a number of the principal features of the present invention. This pump and control valve mechanism is housed within a reservoir housing 58 which, in turn, has a portion extending well into the housing I'I. When the reservoir housing 58 including the pump and control parts is connected to the housing I! and adequate attachments are made for the connection of the pump with a drive shaft within the housing [1, the housing 58 is thereupon retained by means of bolts 59.

The housing 58 has transversely extending sleeve portions 69, as seen more clearly in Figure 3, in which are supported the transversely extending portions 6| of the cylinder supporting links 62. These transverseportions 6| are retained in their connection with, the sleeves by the cotter pins 63, inserted in their inner ends which means of the lift rod 56, whereby lifting movevided an adjustable stop mechanism indicated generally at 68' and taking the form of a quadrant and lever. When the lever is adjusted about the quadrant, the entire cylinder with its piston is moved either fore or aft. For operation of the respectively connected implements, at each side of the tractor, there is provided cylinder devices 69 and I I. Since the arrangement for each of the front cylinders is identical on each side of the tractor, only one will here be described. The cylinder 69 is connected to the lift rod 34 at 12 and is thereby supported therefrom without the necessity of the use of a link 62. In order to effect depth regulating adjustment of \the front implements, there are also provided respectively on the rear axle housing adjustable stop mechanisms 13, taking the form of a quadrant and lever similar to the adjustable stop mechanism for the rear cylinder 65. By an adjustment of the lever forming a part of the adjustable stop mechanisms 13 the cylinder 69 will be moved bodily either fore or aft, taking with it the lifting rod 34, thereby to effect depth regulating adjustment to the working tools 29.

Associated with each of the cylinders for both the front and rear implements, there is provided a spring arrangement 15 adapted to hold the implements in the ground. This spring arrangement includes an over-center toggle connection 16 whereby minimum effect of the springs is present when the cylinders are operated to effect lifting of the implements; thus, the cylinders do not have to work against the spring to any great degree upon lifting of the implements. Since these spring arrangements 15 form no part of the present invention, further detailed description is believed to be'unnecessary.

A11 three of the adjusable stop mechanisms are accessible to the operators station 25 whereby the operator may adjust independently either of the side-mounted implements or the entire rear implement arrangement. Movement of the adjusting levers effects bodily movement 'of the the connection of the cylinder supporting links This reservoir housing 58 includes a main body portion 11 adapted for the retention of the hyregister with a recess portion 64 of the housing 58. In the present arrangement, however, only one cylinder-supporting link 62 is being used and that is-for the support of used for the operation of the transverse rockshaft 59 to lift the rear implements. This cylinder 65 is pivotally connected to the upper end of the link 62, as indicated at 66, and is connected to the arm 61 on the rock-shaft 59 by means of a rod 68 extending from the forward portion of thecylinder and connected at the same location 66 that the cylinder 65 is connected to the supporting link 62, as indicated at 68a. In order to provide for vertical depth adjustment of the rear implements, there is prothe cylinder device 65 draulic fluid and has a drain plug 18 for the removal of the hydraulic fluid from the same. The upper portion of the housing has a pipe 19 connected thereto and adapted to extend upwardly through an opening 89 in the top part of the transmission and differential housing 11. To this pipe may be connected a cover cap 8|. When this cover and breather cap 6| are removed, the hydraulic fluid may be poured into the reservoir housing 58. For the'insertion of the reservoir housing 58 into the transmission and differential housing [1, the cover and breather cap 8| should be removed.

The housing 58 when fitted into the housing I! is so arranged that the drain plug 18 is rearward of the supporting link sleeves 69 with relation to the tractor. At the rear end portion of 7 through the connecting shaft 9 I.

'arm 98 having a lateral projection 99.

58 may be inserted into-the housing an operable control lever I04. When the housing the reservoir housing 58, there is provided a supporting plate 86 which carries a pump housing or casing 81 and the valve control mechanism indicated generally at 88. This supporting plate 88 may be fixed tothe portion 11 of the housing by means of the bolts 89. Projecting rearwardly through the supporting plates is a drive shaft 90 adapted to be connected to a driven shaft within the housing I1 by means of a connecting shaft 9| retained against vertical movement in its connection with the shaft 90 by means of a sleeve 92 surrounding the 'interfitted ends of the respective shafts 90 andSI. This sleeve is held against lateral displacement by a cotter The supporting plate 86, when removed from the reservoir housing 11, carries with it the pump and the control mechanism, leaving the reservoir housing 11 void of practically all of its working parts except a rotatable and manually operable shaft 95 carried in the upper portion of the housing 58 and rotatable in the bearing portions 96 and 91 thereof, as seen particularly in Figure 3. This rotatable shaft 95 has rigidly clamped thereto an This arm will rotate upon rotation of the shaft 95.

In order to provide means for the operation of this shaft 95 adapted to extend laterallyfrom the housing 58 and still permit connection of the shaftafter the housing 58 has been inserted in the housing I1, the shaft 95 is provided with a head portion IOI having grooves I02 extending diametrically across the face'of the same.

pin 93 extending s the channel II 8, the

seated a plunger I24 adapted normally to be retained against movement into the channel II8 by shoulder portions I25 forming a part of the opening I23. When plunger I24 is moved upwardly in the opening I23. The function of this plunger I24 will be described further in detail hereinafter in the description. It may be said for the present that this plunger forms one of 10 the principal features of the present invention.

The cover plate I II has a forwardly extending sleeve -valve containing portions I21 formed with a chamber opening I28 for the reception of a sleeve-valve II9. This sleeve-valve is slidable fore and aft in the opening I28 and when 25 by-pass opening slid to the position shown in Figure 5 coversa by-pass opening I30. The opening I28 extends rearwardly through the cover plate III, so that the same may have communication with the channel portion II5 of the casing'81.

When the sleeve-valve I29 is in the position shown in Figure 4, the fluid entering the inlet portion I I4 of the casing 81 and passing to the pressure side II 5 of the pump is delivered through the I80, the sleeve I29 not being in position to close this opening I30. In this way, the hydraulic fluid from the pump is returned to the fluid supply within the reservoir 58. The pump is constantly driven at all times 30 when the engine of the tractor is operating.

This shaft 95 also has within its head portion and extending well within the same,,a threaded hole I03. With such an arrangement the housing I! without 58 is located in place, the control lever I 04 with its laterally extending portion I05, on the forward end of which are projections I06, is adapted to be connected with the grooves I02. The por- Pivotally connected to the forwardly extending sleeve-containing portion I21 is a lever portion I adapted for the operation of the sleeve I28. The pivotal connection of the :lever I85 with the sleeve-containing portion I21 is by means tion I05 is inserted through the opening I01 of the housing I1 and made fast with the shaft 95 by means of a long bolt I08 adapted up within the hole I03 of the shaft 95.

Referring particularly to Figure 6, there is shown the pump casing 81 in end view as viewed along the line 86 of Figure 4. This casing is adapted to be fastened to the forward face of the supporting plate 86 by means of bolts IIO passing through a cover plate III for rigidly flxing the entire assembly to the supporting plate 86. This pump casing 81 has within it a drive pump gear H2 and a driven pump gear H8. The drive pump gear H2 is connected to the drive shaft 90, which extends through the supporting plate 85. Integral with the casing 81, is a downwardly extending inlet portion II4 adapted to extend within a short distance from the bottom of the housing 58 through which the hydraulic fluid is drawn into the pump. This fluid is delivered from the pump to the outlet side II5 of the pump to a channel IIG within the casing 81. Communicating with the channel IIB are the outlet ports IIB-and II9. These ports are controlled by ball valves I20 and I2I respectively, and are normally retained in their closed positions by springs I22. These ball valves are maintained against their respective valve seats which are formed within the pump casing 81 as a part of the outlet respectively.

Also in communication with the channel 8 in the casing 81 is an opening I23 in which is to tighten ports H8 and II9;'

of a pin I38 extending transversely through the containing portion I21 and through a second lever portion I35 and through a bearing I31 laterally spaced on the cover plate-III with 112- 40 spect to the containing portion 3. These lever portions I35 and I35 in effect straddle the containing portion I21. The pin I88 is retained against lateral movement by its I39 on its 5 opposite end. Extending across the upper end of the lever portions I35 and I35 is a.

portion I40 having a the pin I38 and also tending portion I42.

transverse portion I4I iournaled on having an upwardly ex-- This upwardly extending portion I42 has an elongated slot I43 in which effect movement by means of the projection 99 of the arm 88 is disposed at the time of alining the cover plate tory to/securing it in place; see Figures 3 and 5.

-The sleeve-containing portion I21 also has at each side thereof a longitudinal slot I44 with which the lower ends I45 and I 46 of the lever portions I35 and I35, respectively, are alined transversely. These lower ends I45 and Bare in the form of a fork having an open end slot I41. Through the valve sleevel29 there is pro- Jected a pin I48, which extends into the forked ends I45 and I46. It should now be apparent that operation of the levers I35 and I35 will the pin I48 to the valve sleeve I29. As the operable lever I04 is rotated to effect forward movement of 'the transverse portion I40 of the levers I35-I35, closing of the by-pass port I30by the sleeve-valve I29 is effected for establishment of the pumped fluid in power-transmitting relation with and for moving the implements from tion. Upon doing this, fluid channel H6 is delivered to the and from there, respectively,

the working posifrom the pressure ports H8 and H9 to a casing I49 connected to the rear face of the supporting pressure is presentwithin I21, see Figure 88 prepararegistering respectively with openings I53 and I54 within the supporting plate 86, which in turn register with the openings H8 and H9, respectively, in the pump casing. 81.

As the manual control arm I04 is operated to close the sleeve-valve, it i resisted by a coil spring I55 surrounding the pin I36 and having one end engaging with the forward face of the transverse portion I40, having a portion I56 and another portion I51 circling a pin I58 serving as a reaction point for the spring. The portion I51, being circular, tends to prevent sliding of the spring I55 along the pin I316.

In order to maintain the sleeve-valve I29 monientarily closed, there is provided a latch element I59 having a latch portion I60 adapted to engage with the transverse portion I40 and pivoted on a pin I6I in the cover plate III. This latch lever I59 also includes a rearwardly extending portion I62 arranged for engagement with the upper end of the plunger I24. This latch member I59 is so formed and arranged for its connection with the transverse portion I40 that, so long as the plunger pin I24 is not thrust outwardly by pressure in the channel II6, the latch member'will not latch with the transverse portion I40. This is one of the principal features of the present invention, in that it prevents any latching of the manual lever I04 while the tractor and pump are not operating. This prevents any one from latching the sleeve-valve in its closing position at a time when the pump is not operating. This is particularly useful when the tractor is left standing with its implements in their down position,, thereby eliminating the ne.- cessity for having the hydraulic arrangement going through the cycle of lifting the implement before it can be again placed in its down posi: tion. Once the pressure is On and the plunger I24 is thrust, the latch I59 will stay in its latched position in engagement with the transverse portion I40.

The sleeve-valve I29 has extending longitudinally through the same small openings I63 to permit communication of fluid through the interior of the sleeve-valve to its rear end of the chamber opening I28 of the sleeve-containing ortion I21. The rear end of thi opening I28 is in communication with an opening I64 havplate as. This casing 149 has ports II and I52 of sleeve I29 by" means of the pin I48. It should now be seen that means has been provided responsive to pressure for automatically unlatching the latch member I59 when a predetermined pressure has been obtained within the opening I28. This unlatching takes place when the implements have been raised to their transport position. Any fluid that passes the opening I69 to move the cap I10 may pass through the downwardly relieved portion I13 of the cap and return to the fluid supply in the reservoir.

Referring back to Figures 1 and 2, there are shown hose connections I14, I15, and I16. The hose connections I14 and I15 are for the connection of the respective cylinders 11 and 69 for the operation of the front mounted implements. These two ose'connections I14 and I15 are connected to the casting I49, one at each side thereof, and in communication withthe opening I52 through the casting I49. The fiuidwhich passed by the ball valve I20 passes to both of these cylinders 1| and 69 to effect the lifting of the front implements at both sides of the tractor simultaneously. The hose connection I16 for the rear cylinder device is connected to the portion I18 of the casting I49 for communication with the opening I5I through the casting which receives the fluid passing by the second ball valve I2I.

In order to insure delayed operation of the rear implements, there is provided, as shown in Figures 7 and 8, a delayed lift valve which doe not operate until the front implements have been lifted. This valve is so constructed that it may be adjusted for any predetermined pressure. The fluid for operating the cylinder device 65 is not released until the front implements have operated. This valve consists of a main body portion I19 having a threaded portion I in one end thereof and a second threaded sleeve portion I8I in the opposite end'thereof., Within the body portion I19 is a valve seat portion I62 with which a slidable valve I83, having a tapered seat-contacting portion I84, engages. Thi valve I83 is retained within the body portion I19 by an ad- Justable cap screw I85, which is hollowed to permit sliding engagement of the valve I83 within ing a valve eat I65 in contact with which is a ball valve I66 (see Figures 4 and 5). This ball valve I66 is retained by a spring arrangement I61 bearing at all times against the ball and enclosed within a spring arrangement housing I68 adapted to be threaded into the enlarged part of the opening I64.

This spring housing I68 is threaded into the enlarged opening I64, and the'amount which it screws in determines the opening pressure at which the ball valve I66 will open. In the outer end of this spring housing I68 there is an opening I69, through which liquid passing the valve may pass to effect lifting of a cap I10. The cap I10 normally prevents fluid from passing through the opening I69 and this is particularly true when the extended projection portionfI1I of the latch I59 is contacted withit. As the fluid passes through the opening I69, the cap moves upwardly a sufficient distance to cause tripping of the latch, so that the portion I60 moves out of engagement with the transverse portion I40, thereby to permit return of the lever I35-I35' immediately to open the by-pass opening I30, the levers I35-I35' effecting movement the same and to contain a pressure spring I86. To prevent leakage of the delayed lift valve, there is provided a packing I81. In the cap screw I is an ,air opening I88 to prevent creation of a vacuum within the cap screw I85. In the valve body portion I19, there is a passage I88 to supply fluid pressure back of the packing I81 to maintain the same against the end of the cap screw I85 for different adjusted positions of the same within the body portion I19.

The valve contacting portion I84 on the valve I83 has an opening I89 in communication with a chamber I90 of the bodyportion I19 which is in turn communicating through a threaded projecting portion I9l adapted to be secured into a cylinder head I92 for the communication of liquid through a passageway I93. This hollowed portion I89 contains a ball valve I94 adapted to have movement between the valve I83 and a pin I95 extending acrossthe threaded opening I80. This movement is indicated in dotted lines, showing an alternate position of the ball valve I94. When the pressure becomes great within the delayed lift valve, the valve seat portion I84 immediately gives way to permit passage of fluid thereby into the chamber I90. The sleeve valve I83 and ball valve I94 move rearwardly against the pressure of the spring I 86, and fluid immediately passes into the cylinder, the ball valve forming in effect an integral part of the valve I83. Such a valve arrangement has an advantage over an ordinary spring pressure ball valve in that fluid does not normally have an opportunity to delay the action of the ball valve by building up-in back of the same.

The valve portion in the present instance is that of the portion I83 and including the ball valve I94 when the pressure is acting to unseat the valve portion I84 from its seat portion I82. The function of the ball valve in the present invention is merely for permitting free return of fluid from the cylinder to the reservoir upon the lowering of the implements, since the valve I83 is only open when there is sufficient pressure ahead of it.

Referring now to Figures '1, 9, and 10, there is shown the rear fluid cylinder device I55. It should be understood, however, that the cylinders 89 and 1| are of the same construction. These cylinders are of the single-acting type operated to effect lifting of the implement, but return to their original position when the fluid is drained from them to release the implement. The cylinder arrangement is substantially the same as that shown in the pending application, Serial No. 222,739, filed August 3, 1938, by the present inventor. A piston, indicated generally at I91, has a hollow compression chamber I98 into which fluid, whichmay have leaked by the piston, passes upon movement of the piston toward the right, and, due to the air compressed therein by such fluid entering the chamber, this same fluid may be forced back to the working side of the piston upon release of the fluid from that side of the piston. The piston I91 is constructed of two parts,.I99 and 200, which are fastened to a' reduced end portion 20I of a piston rod 202. The projecting portion 20I has a threaded portion 203 to which the piston portion 200 is connected to retain a leather piston ring 203' against the piston portion I99, which in turn is held against a shoulder 204 of the piston rod 202.

The cylinder 65 includes a second head member 205 in which slides the piston rod 202. Immediately surrounding the piston 'rod 202, there is connected and forming a part of this head member a sleeve 206 extending a considerable distance outwardly from the head member 205 to keep dirt from working along the piston rod 202.

Within the head member 205, there is a recess 201 in which-is contained a seal 208 adapted to fit around the piston rod 202 working through the head member 205. This seal is effective to keep fluid from being forced along the piston rod 202 during the working movement of the piston, and it fits about the piston rod 202 so snugly that it travels with the piston rod on the return movement. However, as the piston is moved to the right, no sealing takes place until the piston has traveled nearly its full dfstance to the right; then the seal 208 is retained against the recess 201 by means of a spring 209. Any fluid that is then within the right end of the cylinder will be forced through a valve 2I0 into the compression chamber I98. When the fluid is relieved from the working side of the cylinder 85 at the left, the

compressed air within the chamber I98 forces .the fluid through a passageway 2 in the projected portion 203 of the piston rod 202 and past a valve 2| 2 in the portion 20I of the piston I91. Since the piston I91 and the breather seal 208 form no part of the present invention, it is believed that this description will be suflicient.

A control rod 2I3, Figure 1, having a back end portion disposed accessibly to the operator's station 25 is employed for manipulating the control arm I 04, Figure 3, of the fluid pressure developing I apparatus. This control rod is axially slidable shown) of said rod extends into connection with the upper end of said control arm I04. Fore and aft movement of the control rod, therefore, causes corresponding pivotal adjustment of the arm I04 with the above explained results for raising and lowering the ground-working tools.

The rod is pulled rearwardly thereby to effect latching of the transverse portion I40 by the latch member I59. This can be effected providing the plunger I24 is thrust outwardly into contact with the projection I62 of the latch I59. With the pump operating, this can be readily effected and the mechanism is ready to effect the lifting operation. Fluid then passes the ball valve I20 to the cylinders 69 and 1|, whereby lifting of the front implements is immediately effected. Because of the delayed lift valve I19, fluid is prevented irom passing to the cylinder until lifting of the forward implements has been completed and until'suflicient pressure can be built up to operate the valve I83 within the same against the spring I86 of the delayed lift valve shown in Figures 7 and 8. Once the valve I 83 is operated, the cylinder 85 will, be filled and the rear implements will be subsequently lifted. Upon completion of the lifting of all implements, ,a greater pressure is then built up in the arrangement to effect operation of the valve I66 for permitting actuation of the cap I10 which in turn effects unlatching of the latch member I59 from the transverse portion I40 of the levers I 35I35', thereby to effect opening of the port I30 to continue the interchange of fluid between the pump and the fluid'reservoir.

Once the implements have lifted, the fluid is retained in t he cylinders by the ball trap valves I20 and I2I. To effect lowering of the implements, these ball valve I20 and I2I must be opened. As means for effecting opening of these valves, there are provided within the pump cover plate III two plungers 2I5 and 2I6 adapted to contact respectively the ball valves I20 and I 2I (see Figure 4). Pivoted to the transverse portion I40 of the control levers I35-I 35' is a plunger-operating device 2I1 having a face portion 2I8 adapted to contact the ends of the plungers 2I5 and 2I8. Once the latch mechanism is operated, the hand control returns to a neutral position under the force of the spring I55, Figure 3, as the latter imparts retrograde pivotal movement to said transverse member 40. Thereafter, at any selected time, additional retrograde pivotal movement is impartable to the transverse member I40 by manually pushing the control rod 2I3 an additional distance forwardly to first effect engagement of the face 2I8 with the plunger 2I5 to operate the same, thereby permitting lowering of the front implements. Further manual movement of the operating control rod 2I3 forwardly effects operation of the plunger 2 I 5, thereby to lower the rear implements. To insure themost satisfactory ope ation of this plunger-operating device 2I1, there is a projection 2I9 which contacts with a raised portion 220 on the cover plate III. Inasmuch as the weight of the implements effects great fluid pressure on the ball valves I20" and I2I, a very definite effort is necessary to effect operation of the control rod 2I3' forwardly to lowerthe implements. The feel of this pressure to the 2 operator is very much the same as in the operation of a transmission gear shift of an automobile. The return of the fluid from the cylinder ation of front and rear implements directly connected to a tractor; that in the arrangement the front and rear implements are raised successively after having initiated the operation by the mere closing of the by-pass opening my and, that lowering of the implements may be readily eflected by the operator upon giving to the control rod 2H3 a reverse movement from a neutral position, and may efl'ect lifting of the implements, and that the timing of the lowering operation is effected manually by the operator, thereby to obtain successive lowering of the implements. It should be further apparent that automatic pressure-operating means has been provided for unlatching the control mechanism when a predetermined pressure has been obtained, and further that latching of the implement can only be done at a time when the arrangement is prepared for operation to lift the implements.

While various changes may be made in the specific construction of the present arrangement, it shall be understood that such changes shall be made withinthe spirit and scope of the present invention as defined in the appended claims.

What is claimed is:

1. In combination, a tractor, an implement connected to the tractor for movement thereon, a hydraulic arrangement for moving the implement comprising a fluid reservoir, a fluid operable device connected to the implement, a fluid pump for delivering fluid to the device, manual control means for controlling the delivery of fluid from the pump to the device, means for retaining said control means in a position to eflect the movement of the implement, and means for making said retaining means dependent upon the operation of the fluid pump in order to retain the control means.

2. In combination, a tractor, an implement connecied to the tractor for movement thereon, a hydraulic arrangement for moving the'implement comprising a fluid reservoir, a fluid operable device, a fluid pump for delivering fluid to the fluid operable device, manual control means for controlling the delivery of fluid under pressure from the pump to the device, latch means adapted to retain the control means in a position to effect movement of the implement, and means for making the retaining means dependent upon the operation of the fluid pump in order to retain the control means.

3. In combinaiton, a motor-propelled vehicle and an implement connected to said vehicle for movement with respect thereto, a fluid operablecylinder, 9. fluid. supply reservoir connected with the implementto move the same, a fluid pump adapted to be driven by the motor, inlet passageway means connecting the pump with the reservoir, passage meansfor directing fluidi from the pump to the cylinder, by-pass means for efl'ecting normal interchange of fluid between the pump and the reservoir, a valve biased to open position for controlling the by-pass means to direct the closing of said valve for retaining said valve in its closed position, and means for making the retaining means dependent upon the operation of the fluid pump in order for it to retain the biased valve in its closed position.

4. In combination, a motor-propelled vehicle and implement connected to said vehicle for movement with respect thereto, a fluid-operable cylinder, a fluid supply reservoir connected with the implement to move the same, a fluid pump adapted to be driven by the motor, inlet passageway means connecting the pump with the reservoir, passage means for directing fluid from the pump to the cylinder, by-pass means for effecting normal interchange of fluid between .the pump and the reservoir, a valve biased to openposition for controlling the by-pass means to direct the fluid to the cylinder, means effective upon the closing of said valve for retaining said valve in its closed position, and means for making the retaining means dependent upon fluid pressure in the passage means from-thepump in order for it to retain the biased valve in its closed position.

5. In combination, a motor-propelled vehicle, an implement connected to said vehicle for movement with respect thereto, a fluid supply reservoir, a fluid driven motor connected with the implement to move the same, a fluid pump adapted to be driven by the vehicle motor, inlet passage means connecting the pump with the reservoir, passage means for directing fluid from the pump to the cylinder, by-pass passage means for efiecting a normal delivery of fluid from the pump to reservoir, a manually operable valve in control of said by-pass passage and normally biased to an open position to provide such normal delivery to the reservoir but closable to divert the fluid to said motor, a latch means for retaining said valve .in its closed position, and means for making said latch means dependent upon the operation of the fluid pump in order to retain the valve in its closed position.

6. In combination, a tractor having a power plant, an implement connected to the tractor and having parts adapted to be moved, a fluid reservoir, a fluid operable device connected to the implementparts to move the same, a fluid pump for delivering fluid from the reservoir to the fluid operable device and adapted to be driven by the tractor power plant, by-pass means for permitting flow of fluid to return to the reservoir when fluid is not being delivered to the fluid operable device, a sleeve-valve for closing the by-pass means to divert the flow of fluid to the fluid operable device, manual control means for operating the sleeve-valve, said sleeve-valve constructed to permit the passage of fluid axially through the same while at the same time closing the by-pass means, means for retaining the sleeve-valve in its by-pass closing position only when the pump is operating, and pressure responsive means receiving fluid pressure from the fluid passing axially through the sleeve-valve for releasing the retaining means.

'1. In combination, a motor-propelled vehicle, an implement connected to the vehicle and having parts adapted to be moved, a fluid reservoir. a fluid-operable device adapted to move the implement parts, a fluid pump adapted to be operated by the motor of the vehicle for delivering fluid from the reservoir to the fluid-operable device, by-pass means for the return of fluid to pass means biased to an open position and havfluid to the cylinder, means eflective upon the ing a passageway for permitting the flow of fluid therethrough while at the same time closing the by-pass means, means for operating said sleevevalve, means for retaining the sleeve-valve and its operating means when moved to a position for closing of said by-pass means, and pressure responsive means arranged to be operated from fluid passing through the sleeve-valve for releasing the retaining means when a predeter' mined pressure hasbeen reached in the arrangement.

8. In combination, a motor-propelled vehicle, an implement connected to thevehicle and having parts adapted to be moved, a fluid reservoir, 8. fluid-operable device for moving the implement parts, a fluid pump adapted to be operated by the motor of the vehicle for delivering fluid from the reservoir to the fluid-operable device, a control mechanism for governing the flow of fluid from the pump, means for supporting said mechanism within said reservoir, said mechanlsm comprising a projected chamber portion on said supporting means having a fluid communication with the pump and having by-pass means for normally permitting flow of fluid between the pump and reservoir, a sleeve-valve operablein said chamber for controlling the flow offluid through the by-pass means, whereby fluid will be diverted to the fluid-operable device, a lever carried by the projected chamber portion for operating said sleeve-valve and biased to normally maintain the valve in its open position, a latch member associated with said lever to retain said sleeve-valve in its closed position, and pressure responsive means operable from pressure within the same for operating on said latch to release said lever to discontinue the flow of fluid to said fluid-operable device.

9. In combination, a motor-propelled vehicle, an implement connected to the vehicle and having parts adapted to be moved, a fluid reservoir, a fluid-operable device fo moving the implement parts, a fluid pump for delivering fluid from the reservoir to the fluid-operable device, means on the vehicle for operating the fluid pump, a con trol mechanism for governing the flow of fluid from the pump, means for supporting said mechanism within said reservoir, said mechanism comprising a projected chamber portion on said supporting means having a fluid communication with the pump and having by-pass means for normally permitting flow of fluid between the pump and reservoir, a sleeve-valve operable in said chamber for controlling the flow of fluid through the by-pass means whereby fluid will be diverted to the fluid-operable device, a lever carried by the projected chamber portion for operating said sleeve-valve and biased normally to maintain the valve in its open position, a latch member associated with said lever to retain said sleeve-valve in its closed position, said sleeve-valve having a passageway for permitting the flow of fluid therethrough to a part of the chamber projecting portion while at the same time closing the by-pass means, and pressure responsive means operable from pressure of fluid passing through the sleeve-valve for operating on said latch to release said lever to discontinue the flow of fluid to said fluid-operable device.

10. In combination, a draft vehicle, an implement connected to the vehicle" and having parts adapted to be moved, a fluid-operable device for moving the implement parts, a fluid reservoir housing having a main body portion and a closing plate, fluid pressure supply means for delivering fluid from the reservoir to the fluidoperable device, a control mechanism connected to said plate and adapted to extendinto said housing when the plate is connected to the main body portion, a shaft separately supported in the body portion and adapted to be operated by means externally of the housing, and means for effecting engagement of the control mechanism with the shaft to be operated by. the same upon fitting the control mechanism within'the housing to assemble the arrangement.

11. In combination, a draft vehicle, an implement connected to the vehicle and having parts adapted to be moved, a fluid-operable device for moving the implement parts, 'afluid reservoir housing having a main body portion and a closing plate, fluid pressure supply means for delivering fluid from the reservoir housing to the fluid-operable device, a control mechanism connected to said plate and adapted to extend into said housing when the plate is connected to the main body portion, a shaft separately supported in the body portion and adapted to be operated by means externally of the housing, and means for effecting engagement of the control mechanism with the shaft to be operated by the same upon,fltting the control mechanism within the housing to assemble the arrangement, said engaging means comprising a lever forming a part of .the control mechanism and having an elongated slot therein, and an arm flxed to the shaft and having a laterally extending engaging projection on the end thereof adapted to fit within the slot in said lever.

12. In combination, implement-supporting means, an implement mounted at one location on the implement-supporting means for movement thereof, a hydraulic mechanism including mounted at another location on the implementsupporting means for movement with respectv of the devices whereby successive movement of the respective implements will be effected upon actuation of the hydraulic mechanism.

13. In combination, a tractor having forward and rearward portions, an implement mounted on the forward portion of the tractor for ver--' tical movement to and from its ground-working position, a second implement mounted on the rearward portion of the tractor for vertical movement to and from its ground-working po-' sition, a hydraulic lifting arrangement comprising a. fluid-operable device connected to eachlimplement respectively to move the same, a hydraulic supply source having fluid communications with the respective fluid devices, and a delaying valve in the communication to the fluid operable device which operates the implement on the rearward portion of the tractor whereby successive lifting movement of the forward and rearward implements will be effected upon actuation of the hydraulic lifting arrangement.

14. In combination, a tractor having forward and rearward portions, a set of implements mounted for movement on the forward portion and respectively at each side of the tractor, a set of implements mounted for movement on the rearward portion of the tractor, a hydraulic lifting arrangement comprising a fluid-operable devicefor the set of implements on the rearward portion of the tractor, a hydraulic supply source having fluid communications with the respective jfluid devices, and a delaying valve in the communication to the fluid-operable device which operates' the implement set-on the rearward portion' of the tractor, whereby -successive lifting movement of the forward and rearward sets will 'be effected upon actuation of the hydraulic lift- .ing arrangement.

15. In combination, implement-supporting means; an implement mounted at one location on the implement-supporting means for movement with respect thereto, a second implement -.,mo1mted at another location on the implementsupporting means for movement with respect -'thereto, a single-acting fluid-operable device for each implement and connected to the same to eflect'working movement thereof, a hydraulic mechanism including fluid communications with .each .of the fluid devices, control means for effecting operation of the hydraulic mechanism to cause fluid to flow through the communication toward the devices, and a' delaying valve in the communication to one of the devices to effect successive movement of the respective implements, said control mechanism being effective to retain the .fluid within the devices at the completion of movement, said delaying valve including structure to permit return of fluid from the fluid devices upon release of the fluid retained in the devices by the control mechanism.

16. In combination, a tractor having a hollow body portion, an implement connected to the tractor for movement with respect thereto, and a hydraulic arrangement for moving the implement including a reservoir housing adapted to be fltted within the hollow body portion of the tractor, said housing including a supporting plate and a main body portion, and pump and control mechanism supported entirely on the supporting plate and being removable therewith from the main body portion of the reservoir upon removal of the reservoir housing from the hollow body portion of the tractor.

17. In combination, a tractor, an implement mounted on the tractor for movement with respect to the same to and from a working position, a fluid pump for supplying fluid under pres- 1 sure for establishment in power-transmitting relation with and for moving the implement from the working position, a manually manipulatable valve in control of the fluid supplied by said pump and manipulatable to an active position for so establishing such fluid in power-transmitting relation between the pump'and the implement, retaining means settable for retaining the valve control means in said active position, and means responsive to the pressure of the pumped fluid for so setting said retaining means.

CARL W. MOTT.

7 CERTIFICATE OF connzc'rxom. Patent No. ,5 h,866 v an 20,1915.

CARL w. MOTT.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows; Page 7, sec- 0nd column, line 58, claim 12, strike out the words "thereof, a hydraulic mechanism including" and insert instead --with respect thereto, a second impl ement; and that the said Letters Patent shonld be read with this correction therein that the same may conform to the record' of the cgse in the Patent Office.

Signed and. sealed this 2nd day of November, A. D. 1914.5.

Henry Van Arsdale,

i Acting ooyrxissioner of Patents. 

